Well technically magic has no color, just different effects (i classify as dark or white just to help me keep track of boundries) White magic IS slightly weaker than dark magic, but is always for the greater good, it has no bad effects, HOWEVER dark magic(black magic) is very powerfull, it is usually consistant of forcing something to go against its nature or forcefully taking something, or anything of that sort. But dark magic has what i call the 3 fold law (basically karma) where everything will come back to you 3 fold Ex:im a psi vamp who takes life forces (forcefully taking something very powerfull) so if i fed on humans (am a "vegetarian") i will live longer BUT i will look older when im younger due to my body deteirorating. Different types of dark magic have different effects so make sure you know the consequences before you do anything, personally i would recommend doing white magic and a mix of grey magic (the in between category) but just my opinion hope this helps ^^

Some state that there is no colour in magick; again this is deifferent beliefs, therfore you have to go with your own instinct read and find out all the information on the two subjects and go with what you feel you are drawn too.

I personally believe that Dark magick are those that work along different dieties but also Not all but most do a lot of dark magick towards others, like cursing, binding etc. (this is not to offend anyone) Yet I do White magick so my views are different; White magick is to do good (in my eyes what I see is good; again others have different views), help others banish, work with different dieties, and not doing harm to others.

Hope that hurts
Like I said I am not saying this to offend others just giving my point of view to try and help. :)

I don't think there is a right or wrong answer to the question. Everyone is right because that is what they believe. I would cation you to not do any magicks until you know what you are doing. Read and learn, because even "white magick" can go wrong if the person performing it doesn't know what they are doing.

Also if you cast magick and you dont know what you are doing or prepare yourself before hand; as in grounding, meditating, focusing your spells can back fire come back to hurt you or others that you are close too, then the karma and hurt none is broken and you will have to deal with the consiquences!!
So be careful when casting any magickal spells